Bullata guerrinii is a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails.
The size of the shell varies between 20 mm and 37 mm. The shell shows distinct cream spots against a caramel or dark brown background. There are faint upward spiraling bands on the shell. The lip has a moderate thickness. The long aperture is about as broad as the thickness of the lip.
This species occurs in the Atlantic Ocean off Eastern Brazil.